Mass Change to APPEND Text to Operation Short Text Not Replace

I need to make a mass change in CEWB to Work Centers in specific operations of routings. I want to APPEND text to distinguish these operations that I changed from the rest. I tried mass changing by using standard text, problem is it only REPLACES it doesn't APPEND.

Can I get the text to be appended to the operation short text instead of replace?

If not, any suggestions of how to distinguish these operations I changed from everything else?